Brushless motor rotor assembly and brushless motor

Abstract

The utility model provides a brushless motor rotor assembly and a brushless motor. The brushless motor rotor assembly comprises a rotor chip, a plurality of magnets and elastic insulation support columns. The rotor chip comprises a first rotor chip and second rotor chips which are fixed at two ends of the first rotor chip and are the same as the first rotor chip in shape and size; the central positions of the first rotor chip and the second rotor chip are respectively provided with a shaft connecting hole for a motor shaft to pass through. The periphery of the first rotor chip is also uniformly provided with a plurality of mounting holes. The elastic insulating support column comprises a positioning part and a clamping part matched with the mounting hole, the height of the clamping part is the same as the thickness of the first rotor chip, a slot for accommodating a magnet is formed between two adjacent positioning parts, the magnet is fixed at the periphery of the first rotor chip through interference fit with the two adjacent positioning parts, the mounting operation is easy, and the mounting efficiency is high. The second rotor chip can be used for preventing the elastic insulating support column from falling off, and can keep the stability of the magnet in both high and low temperature environments; the brushless motor is provided with a plurality of rotor assemblies, so that the motor performance can be optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a kind of brushless motor rotor assembly and brushless motor. BACKGROUND

[0002] Motor is the electromagnetic device according to electromagnetic induction law to realize electric energy conversion or transmission, is composed of stator and the rotation of relative stator rotor.Motor usually includes brush motor and brushless motor, brushless DC motor is composed of motor main body and driver, and it is a typical mechatronics product, wherein permanent magnet brushless motor is widely applied due to the characteristics of longer service life.

[0003] Due to the relatively expensive raw material of permanent magnet, resulting in high cost of permanent magnet motor, magnet charging is mostly adopted multi-pole charging mode, and the interval between adjacent poles of 2, 4, 6, 8, 10 and other even poles leads to a large degree of waste of permanent magnet. The installation method of magnet has always been a difficult problem. For the installation of ring-shaped or arc-shaped patch-type magnets, the current general method is to use glue to bond, which has not very good installation strength and installation effect. The stability of glue decreases significantly after the motor is used for a long time in a high-temperature environment, and it is difficult to meet some high-safety-performance motors. In addition, some complex installation methods result in low installation efficiency.

[0004] Therefore, it is necessary to provide a stable and easy-to-operate magnet installation method to solve the above problems. INVENTION CONTENTS

[0005] The utility model discloses a kind of brushless motor rotor assembly and brushless motor, to solve the installation of the patch-type permanent magnet in the above background art generally adopts the way of glue bonding, its installation strength and installation effect are not very good, the stability of glue decreases significantly after the motor is used for a long time in a high-temperature environment, difficult to meet some high-safety-performance motors, in addition, some complex magnet installation methods result in low installation efficiency.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of brushless motor rotor assembly, including rotor chip, multiple magnets and elastic insulating support column;

[0008] The rotor chip includes a first rotor chip and a second rotor chip fixed to the two ends of the first rotor chip;

[0009] The center position of the first rotor chip and the second rotor chip is correspondingly provided with a shaft hole for the motor shaft to pass through, and a plurality of mounting holes are uniformly provided around the first rotor chip.

[0010] The elastic insulation support column comprises a positioning part and a clamping part matched with the mounting hole, a slot for accommodating the magnet is formed between the two adjacent positioning parts, and the magnet is fixed on the periphery of the first rotor core through interference fit with the two adjacent positioning parts;

[0011] The height of the clamping part is the same as the thickness of the first rotor core;

[0012] The first rotor core and the second rotor core are the same in shape and size.

[0013] Preferably, the two sides of the positioning part are provided with arc-shaped baffles extending in the circumferential direction.

[0014] Preferably, the height of the magnet is the same as the sum of the thicknesses of the first rotor core and the two second rotor cores, and the height of the positioning part is the same as the height of the magnet.

[0015] Preferably, the cross sections of the first rotor core and the second rotor core are octagonal, and the peripheral surfaces of the first rotor core and the second rotor core are prismatic.

[0016] Preferably, one side of the magnet is a positioning plane matched with the prismatic surface, and the other side is an arc surface.

[0017] Preferably, the mounting hole is arranged at the top corner of the first rotor core, and the positioning plane of the magnet is fixed on the peripheral surface of the first rotor core and the second rotor core.

[0018] Preferably, a plurality of trapezoidal holes are uniformly arranged in the circumferential direction on the outer peripheral side of the shaft hole of the first rotor core and the second rotor core, and a circular hole and an elliptical hole are alternately arranged between the two adjacent trapezoidal holes.

[0019] Preferably, a plurality of arc-shaped grooves are arranged on the hole wall of the shaft hole, and an arc-shaped strip is fixedly connected to the groove wall of the arc-shaped groove.

[0020] Preferably, the elastic insulation support column is made of plastic.

[0021] A brushless motor comprises one or more brushless motor rotor assemblies as claimed in any one of the preceding claims.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] I. The elastic insulation support column is fixed around the rotor core piece, the magnet is fixed around the rotor core piece by interference fit with the adjacent two elastic insulation support columns, the magnet is simply and easily fixed around the rotor core piece in a discontinuous manner, the utilization rate of the magnet is high, a second rotor core piece is riveted and pressed at each end of the first rotor core piece, and the elastic insulation support column can be prevented from falling off due to rotation and vibration of the motor, so that the installation stability of the magnet is ensured.

[0024] II. The rotor core piece is formed by riveting and pressing the first rotor core piece and the second rotor core piece through the oval hole, when the rotor core piece is partially damaged, the damaged part can be replaced by removing the rivet, and the whole rotor core piece does not need to be replaced, so that resource waste is avoided.

[0025] III. A plurality of the brushless motor rotor assemblies are installed in the brushless motor, the motor performance can be optimized, the motor cogging torque is reduced, and the motor runs more stably. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 It is a partial disassembly schematic view of the brushless motor rotor assembly of the embodiment of the present application.

[0028] Figure 2 It is a structural schematic view of the first rotor core piece of the embodiment of the present application.

[0029] Figure 3 It is a structural schematic view of the second rotor core piece of the embodiment of the present application.

[0030] Figure 4 It is a schematic view of the rotor assembly installed on the motor shaft of the brushless motor of the embodiment of the present application.

[0031] REFERENCE SIGNS:

[0032] 10, rotor core piece; 101, first rotor core piece; 1011, mounting hole; 102, second rotor core piece; 103, continuous hole; 104, trapezoidal hole; 105, circular hole; 106, oval hole; 107, edge surface;

[0033] 20, magnet;

[0034] 30, elastic insulation support column; 301, clamping part; 302, positioning part;

[0035] 40. Motor shaft. DETAILED DESCRIPTION

[0036] Hereinafter, only certain exemplary embodiments will be described simply. As can be appreciated by those skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are to be regarded as illustrative in nature and not as restrictive.

[0037] In the description of the present application, it needs to be understood that the terms "center", "thickness", "upper", "top", "outer", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of a specific example are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0041] The embodiments of the utility model will be explained in detail below with reference to the drawings.

[0042] As Figures 1-3 The utility model discloses a brushless motor rotor assembly, including rotor chip 10, a plurality of magnet 20 and elastic insulation support column 30, the rotor chip 10 includes a first rotor chip 101 and the second rotor chip 102 fixed on the both ends of the first rotor chip 101, the existence of the second rotor chip 102 can prevent the elastic insulation support column 30 from falling off due to motor rotation and vibration.

[0043] The rotor chip 10 includes a first rotor chip 101 and the second rotor chip 102 fixed on the both ends of the first rotor chip 101, the existence of the second rotor chip 102 can prevent the elastic insulation support column 30 from falling off due to motor rotation and vibration.

[0044] The center position of first rotor chip 101 and second rotor chip 102 all corresponds to set up the through hole 103 of connecting shaft for motor shaft 40 to pass through, and the periphery of first rotor chip 101 still evenly sets up a plurality of mounting hole 1011.

[0045] Elastic insulation support column 30 includes positioning part 302 and the clamping part 301 of being adapted with mounting hole 1011, and the insertion slot for accommodating magnet 20 is formed between the two adjacent positioning parts 302, and magnet 20 is fixed on the periphery of first rotor chip 101 through the interference fit with the two adjacent positioning parts 302.

[0046] Among them, the height of clamping part 301 is same with the thickness of first rotor chip 101, and the shape and size of first rotor chip 101 and second rotor chip 102 are same.

[0047] In order to prevent the centrifugal force generated when motor rotates from causing magnet 20 to fall off, the two sides of positioning part 302 are provided with arc-shaped baffle extending along the circumference.

[0048] When assembling, first, the clamping part 301 is clamped in the mounting hole 1011, then the second rotor chip 102 is fixed on the two ends of the first rotor chip 101, and finally the magnet 20 is inserted into the insertion slot formed by the two adjacent positioning parts 302, so that the magnet 20 is fixed on the peripheral surface of the first rotor chip 101 and the second rotor chip 102; the interference fit of the magnet 20 and the two adjacent positioning parts 302 is stable and firm, this installation mode is simple and easy to operate, improves the installation efficiency, and the magnet 20 is discontinuously attached around the rotor chip 10, and the utilization rate of the magnet 20 is high.

[0049] Specifically, the height of magnet 20 is same with the sum of the thickness of a first rotor chip 101 and two second rotor chip 102, and the height of positioning part 302 is same with the height of magnet 20.

[0050] It should be noted that the thickness of the first rotor core piece 101 and the second rotor core piece 102 is determined by the motor structure, and the height of the elastic insulation support column 30 clamping portion 301, the positioning portion 302 and the magnet 20 is determined by the thickness of the first rotor core piece 101 and the second rotor core piece 102.

[0051] In the embodiment, the cross section of the first rotor core piece 101 and the second rotor core piece 102 is octagonal, and the peripheral surface of the first rotor core piece 101 and the second rotor core piece 102 is the edge surface 107.

[0052] The one side of the magnet 20 is the positioning plane matched with the edge surface 107, and the other side is the arc surface; because the positioning plane has good insertion fit with the edge surface 107, the magnet 20 can be installed stably and has small gap with the rotor core 10; and the arc surface can reduce the magnetic leakage coefficient, improve the motor performance, and improve the magnetic field utilization rate of the magnet 20.

[0053] Specifically, the mounting hole 1011 is arranged at the top corner of the first rotor core piece 101, and the positioning plane of the magnet 20 is fixedly attached to the peripheral surface of the first rotor core piece 101 and the second rotor core piece 102.

[0054] In the embodiment, a plurality of trapezoidal holes 104 are uniformly arranged on the outer peripheral side of the continuous shaft hole 103 of the first rotor core piece 101 and the second rotor core piece 102 in the circumferential direction, the trapezoidal hole 104 can reduce the weight of the motor rotor, thereby reducing the inertia of the motor rotation; the circular hole 105 and the elliptical hole 106 are alternately arranged between the adjacent two trapezoidal holes 104.

[0055] In the assembly, the circular hole 105 is used for assembly direction feature recognition and positioning, and the first rotor core piece 101 and the second rotor core piece 102 are fixedly connected by riveting through the elliptical hole 106; when the rotor core piece 10 is damaged, the damaged part can be replaced by removing the rivet, without the need to replace the whole rotor core piece 10, thereby avoiding resource waste.

[0056] In order to ensure the stable installation of the rotor assembly, a plurality of arc grooves are arranged on the hole wall of the continuous shaft hole 103, the groove wall of the arc groove is fixedly connected with an arc strip, the brushless motor rotor assembly is installed on the motor shaft 40 through the continuous shaft hole 103, and the stability of the installation can be ensured through the friction force of the arc strip.

[0057] Further, the elastic insulation support column 30 is made of plastic material, which is not easy to deform in the transportation and production process, so that the elastic insulation support column 30 can keep the state of fixing the magnet 20 in high and low temperature environments, and the installation stability of the magnet 20 is ensured.

[0058] As Figure 4The utility model also provides a brushless motor, including one or more as any one of above brushless motor rotor subassembly, through install multiple above brushless motor rotor subassembly in brushless motor, can optimize motor performance, reduce motor tooth slot torque, make motor operation more stable.

[0059] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A brushless motor rotor assembly, comprising a rotor core (10), a plurality of magnets (20) and an elastic insulating support column (30), characterized in that: the rotor core (10) comprises a first rotor core (101) and a second rotor core (102) fixed at both ends of the first rotor core (101); a center position of the first rotor core (101) and the second rotor core (102) is provided with a shaft hole (103) for passing through a motor shaft (40); a plurality of mounting holes (1011) are uniformly provided around the first rotor core (101); the elastic insulating support column (30) comprises a positioning portion (302) and a clamping portion (301) matched with the mounting hole (1011), a slot for accommodating the magnet (20) is formed between the two adjacent positioning portions (302), and the magnet (20) is fixed on the periphery of the first rotor core (101) by interference fit with the two adjacent positioning portions (302); the height of the clamping portion (301) is the same as the thickness of the first rotor core (101); the shape and size of the first rotor core (101) and the second rotor core (102) are the same. The positioning portion (302) is provided with an arc-shaped baffle extending in the circumferential direction on both sides thereof. The height of the magnet (20) is the same as the sum of the thicknesses of a first rotor core (101) and two second rotor cores (102), and the height of the positioning portion (302) is the same as the height of the magnet (20). The cross section of the first rotor core (101) and the second rotor core (102) is octagonal, and the peripheral surface of the first rotor core (101) and the second rotor core (102) is a prismatic surface (107). One side of the magnet (20) is a positioning flat surface matched with the prismatic surface (107), and the other side is an arc surface. The mounting hole (1011) is provided at a top corner of the first rotor core (101), and the positioning flat surface of the magnet (20) is fixed on the peripheral surface of the first rotor core (1011) and the second rotor core (102).

2. The brushless motor rotor assembly of claim 1, wherein: A plurality of trapezoidal holes (104) are uniformly provided in the circumferential direction on the outer periphery of the shaft hole (103) of the first rotor core (101) and the second rotor core (102), and a circular hole (105) and an elliptical hole (106) are alternately provided between the two adjacent trapezoidal holes (104).

3. The brushless motor rotor assembly of claim 1, wherein: A plurality of arc-shaped grooves are provided on the hole wall of the shaft hole (103), and an arc-shaped strip is fixedly connected to the groove wall of the arc-shaped groove.

4. The brushless motor rotor assembly of claim 1, wherein: The elastic insulating support column (30) is made of plastic.

5. The brushless motor rotor assembly of claim 4, wherein: 10.A brushless motor comprising one or more brushless motor rotor assemblies according to any one of claims 1-9.

6. The brushless motor rotor assembly of claim 5, wherein: ​ 7. The brushless motor rotor assembly of claim 1, wherein: ​ 8. The brushless motor rotor assembly of claim 1, wherein: ​ 9. The brushless motor rotor assembly of claim 1, wherein: ​ ​

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